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I've been showing this post around myself...

2 things comes to mind:
a) mythical man months - Luke is right, the hardest thing is getting consensus on WHAT to build.
b) @ned has been pretty adamant steemit is the model client, and encourages other client development. Mostly because it's easier to manage that way. To the extent other new backend features really can be documented and modularized, he might just go for it.

Obviously SMTs have been the real focus, and no real plan in place for everything that got shoved down the stack of platform improvements. Seems like the right time to bring it up now, in anticipation of several impending hard forks...

Current organization is bottlenecking it's own success!
Keeping in mind Steemit Inc should really be a DAC, and it's not too late to change it.